Nov 15 2012
Topics Covered
Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Introduction
Super alloys or high performance alloys have the capacity to function under very high temperatures and severe mechanical stress, and also where high surface stability is required. They have good creep and oxidation resistance, and can be produced in a variety of shapes.
Strengthening of super alloys is performed by solid-solution hardening, work hardening, and precipitation hardening. Super alloys contain a number of elements in a variety of combinations to achieve the desired result.
Inconel 686™ is a single phase Ni-Cr-Mo-W alloy that is primarily used in extremely corrosive applications, e.g. flue gas desulfurization systems and processing plants in which mixed acids are used. This alloy is also used in fields where localized pitting is difficult.
The following datasheet will provide more details about Inconel 686™.
Chemical Composition
The following table shows the chemical composition of Inconel 686™.
|
Element |
Content (%) |
|
Nickel, Ni |
59 |
|
Chromium, Cr |
19-23 |
|
Molybdenum, Mo |
15-17 |
|
Iron, Fe |
≤ 5 |
|
Tungsten, W |
3.0-4.40 |
|
Manganese, Mn |
≤ 0.75 |
|
Phosphorous, P |
≤ 0.040 |
|
Sulfur, S |
≤ 0.020 |
|
Titanium, Ti |
0.020-0.25 |
|
Carbon, C |
≤ 0.010 |
Physical Properties
The physical properties of Inconel 686™ are outlined in the following table.
|
Properties |
Metric |
Imperial |
|
Density |
8.72 g/cm³ |
0.315 lb/in³ |
|
Melting point |
1338-1380 °C |
2440-2520 °F |
Mechanical Properties
The mechanical properties of Inconel 686™ are provided below.
|
Properties |
Metric |
Imperial |
|
Tensile strength |
721.9 MPa |
104700 psi |
|
Yield strength (@strain 0.200%) |
364 MPa |
52800 psi |
|
Elastic modulus |
207 GPa |
30000 ksi |
|
Shear modulus |
77 GPa |
11200 ksi |
|
Poisson’s ratio |
0.34 |
0.34 |
|
Elongation at break |
71% |
71% |
Thermal Properties
The thermal properties of Inconel 686™ are given below.
|
Properties |
Metric |
Imperial |
|
Thermal expansion co-efficient (@21-100°C/69.8-212°F) |
11.97 µm/m°C |
6.650 µin/in°F |